Application of Foam Stopping for Mitigation of Spontaneous Heating In Underground Coal Mines

The problem of spontaneous heating is a major threat to safety and productivity in mines all over the world. In India, more than 80% of fires are caused due to Spontaneous Combustion. The applicability of inert gases is expensive, time-consuming and is a very tedious process. Hence the application of advanced technologies becomes essential to be introduced in mines. In this context, Central Mine Planning and Design Institute (CMPDI), Ranchi, India carried out an R&D project entitled “Construction of quick setting stopping in case of fire in an underground mine using expansion foam agent” under the funding from the Ministry of Coal, Government of India. Under this project, two Indian mines were selected in consultation with MCL for carrying out the proposed work in Orient Mine No.3 and Bundia Mine of MCL (Ib Valley AREA). Coals from both the mines have been collected and analysed in the laboratory. The proximate analysis and CPT/IPT results show that both the coals are moderately prone to spontaneous heating. Considering both intrinsic and extrinsic properties, two stoppings were constructed in the Hirakhand Bundia mines and four in orient mines. Periodic supervision along with the altering ingress of air from intake was been checked. After careful supervision of nearly 4 years, the stoppings proved to be strong enough to be leakage proof. This paper describes the application of foam technology as stopping to avoid air entry, thus preventing the occurrences of spontaneous heating/fire in a panel of Indian coal mines.

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The development of cross hole seismic techniques and case studies

Exploration Geophysics ◽

10.1071/eg989127 ◽

1989 ◽

Vol 20 (2) ◽

pp. 127 ◽

Cited By ~ 8

Author(s):

G. Duncan ◽

M. Downey ◽

L. Leung ◽

P. Harman

Keyword(s):

Seismic Tomography ◽

Iron Ore ◽

Mineral Exploration ◽

Coal Mines ◽

Seismic Energy ◽

Field Trials ◽

Mine Planning ◽

Broken Hill ◽

Underground Coal Mines ◽

Lead Zinc

This paper outlines the development of a cross hole seismic tomography package by The Broken Hill Proprietary Co. Ltd. (BHP), as a tool for mineral exploration and mine planning. The methodology of cross hole seismic tomography, field procedures, instrumentation, processing software, and field trials are described.Explosives are principally used as the source of seismic energy. A repetitive source, based on rapid hydrogen-oxygen combustion, has also been developed. Signals are detected by geophone-based detector strings, and recorded by a data acquisition system developed by BHP. Tomographic imaging is conducted by the Algebraic Reconstruction, Back Projection and Simultaneous Iterative Reconstruction techniques.Surveys have been conducted in a number of different geological environments, and include: lead-zinc, iron ore and manganese exploration leases and mines to locate mineralisation and overburden interfaces; underground coal mines to locate regions of mining induced stress; and open cut and underground coal mines to locate coal and overburden contacts. The results of these surveys are discussed.

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Effect of Inhibitor in Suppressing Spontaneous Heating of Coal

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.e5963.018520 ◽

2020 ◽

Vol 8 (5) ◽

pp. 2494-2497

Keyword(s):

Mining Industry ◽

Protective Layer ◽

Proximate Analysis ◽

Natural Phenomenon ◽

Spontaneous Heating ◽

Indian Coal ◽

Time Period ◽

Spontaneous Combustion Of Coal ◽

Crossing Point ◽

Crossing Point Temperature

Spontaneous combustion of coal is a natural phenomenon responsible for the burning of thousands of tonnes of coal every year. Normally, when Indian coal gets exposed to air, it catches fire within 9 to 12 months and the application of inhibitors helps in preserving the coal by enhancing its time period (Incubation period). They have the capacity of retarding the spontaneous heating of coal by forming a protective layer around it. This paper deals with four inhibitors and its retardation capacity to spontaneous heating is laid down by experimental investigation. Crossing Point Temperature (C.P.T) analysis and Flammability Temperature analysis (F.T) are the prime method in determining its retardation effect. Coal samples from Mahanadi Coalfield Limited (MCL) were prepared and used for experimentation. Proximate analysis is used to study the composition of coal. The prepared coal sample is treated with inhibitors at three different proportions of 5%, 10% and 15% by wt. Considering the economic and safety application for miner and mining industry, the maximum retardation capacity of an inhibitor at particular percentage is been shown in this paper.

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Rock Load Estimation in Development Galleries and Junctions for Underground Coal Mines: A CMRI-ISM Rock Mass Rating Approach

Journal of Mining ◽

10.1155/2014/618719 ◽

2014 ◽

Vol 2014 ◽

pp. 1-9 ◽

Cited By ~ 1

Author(s):

Avinash Paul ◽

V. M. S. R. Murthy ◽

Ajoy Kumar Singh

Keyword(s):

Rock Mass ◽

Support System ◽

Coal Mines ◽

Design Guidelines ◽

Rock Mass Rating ◽

Indian School ◽

Indian Coal ◽

Underground Coal Mines ◽

Rock Load ◽

Roof Rocks

Rock mass rating (RMR) plays important role in design and selection of support system (Ghosh, 2000). For stability assessment of rock mass it is very important to know the amount of rock load mobilized around the development gallery which is estimated using RMR (Singh et al., 2003, Barton et al., 1974, Bieniawski, 1984, and Ghosh et al., 1992). In Indian coal mines, Central Mining Research Institute-Indian School of Mines rock mass rating (herein after referred to as CMRI-ISM RMR) is mostly used for formulating design guidelines for supports. In this paper an attempt has been made to correlate CMRI-ISM RMR values and rock load of galleries and junctions for different gallery widths, ranging from 3.6 m to 4.8 m, at different densities of roof rocks. The proposed empirical expression can help in quick design of support system for underground coal mines working in the same regime.

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